Remove the ice cream from the freezer and let it sit at room temperature for 3–5 minutes until a spoon glides through without cracking. I've learned this window matters enormously—too frozen and you'll destroy the wafer cookies, too soft and your sandwich collapses entirely.
Arrange all 12 wafer cookies on a clean work surface, pairing them into six groups of two. This preps your assembly line so you're not scrambling mid-scoop and losing time while the ice cream melts in your hands.
Scoop a heaping portion of softened ice cream onto one cookie, then press the matching cookie on top to create the sandwich. Roll the exposed ice cream edges gently into the rainbow sprinkles immediately—because they stick best when the surface is still slightly tacky, before any refreezing happens.
Melt the chocolate chips together with the melted butter in a microwave-safe bowl, stirring every 30 seconds until the mixture reaches dipping consistency. I add a tiny pinch of salt here to cut through the sweetness and make the chocolate coating taste more sophisticated than you'd expect from a simple dip.
Dip each assembled sandwich halfway into the chocolate mixture, then rotate it so the sides coat evenly. Set each one onto parchment paper immediately before the chocolate cools and hardens in an awkward position.
While the chocolate is still slightly soft, press the diced strawberries and any remaining sprinkles onto the wet coating. This single step is what transforms a basic 4th of july ice cream sandwiches family recipe into something that looks professionally plated—your guests won't believe you assembled it in your kitchen.
Transfer the entire parchment sheet to the freezer for at least 2 hours until the chocolate shell sets completely and the ice cream refreezes solid.